When conservatories were first built it was thought that they may save householders money. The idea was that heat energy gained from the sun would be collected in the conservatory and distributed into the house, reducing the amount of heating required.
Unfortunately this concept was based on a conservatory only being used during the hot summer months. In reality, people use their conservatories all year round and heat the room throughout winter. Conservatories can suffer from heat loss at up to ten times the rate of a well insulated room within the house and could be a drain on your heating bill if not insulated correctly.